Overtravel - YASKAWA SGMJV User Manual

4 Operation

4.3.2 Overtravel

4.3.2

Overtravel

The overtravel limit function forces movable machine parts to stop if they exceed the allowable range of
motion and turn ON a limit switch.
For rotating application such as disc table and conveyor, overtravel function is not necessary. In such a case,
no wiring for overtravel input signals is required.
• Installing limit switches
For machines that move using linear motion, connect limit switches to P-OT and N-OT of CN1 as shown below to
prevent machine damage. To prevent a contact fault or disconnection from causing accidents, make sure that the limit
switches are normally closed.
• Axes to which external force is applied in overtravel
Vertical axes:
There is a risk of the workpiece falling during the overtravel status because the /BK signal will remain ON (brake
release). Set the zero clamp status after the servomotor stops (Pn001 = n.1) to prevent the workpiece from falling.
Other axes to which external force is applied:
Overtravel will bring about a baseblock state after the servomotor stops, which may cause the servomotor to be
pushed back by the load's external force. To prevent this, set the parameter (Pn001 = n.1) to bring the servo-
motor to zero clamp state after stopping.
For details on how to set the parameter, refer to (3) Servomotor Stopping Method When Overtravel is Used.
(1) Signal Setting
Type
Input
Rotation in the opposite direction is possible during overtravel by inputting the reference.
(2) Overtravel Function Setting
Parameters Pn50A and Pn50B can be set to enable or disable the overtravel function.
If the overtravel function is not used, no wiring for overtravel input signals will be required.
Pn50A
Pn50B
A parameter can be used to re-allocate input connector number for the P-OT and N-OT signals. Refer to 3.3.1
Input Signal Allocations for details.
4-6
Connector
Name
Pin Number
P-OT CN1-7
N-OT CN1-8
Parameter
n.1
Inputs the Forward Run Prohibited (P-OT) signal from
[Factory setting] CN1-7.
Disables the Forward Run Prohibited (P-OT) signal.
n.8
Allows constant forward rotation.
n.2 [Fac- Inputs the Reverse Run Prohibited (N-OT) signal from
tory setting] CN1-8.
Disables the Reverse Run Prohibited (N-OT) signal.
n.8
Allows constant reverse rotation.
CAUTION
Forward direction
Servomotor
Limit Limit
switch switch
Setting
ON
OFF
ON
OFF
Meaning
SERVOPACK
CN1
N-OT
8
P-OT
7
Meaning
Forward run allowed.
Normal operation status.
Forward run prohibited. Forward overtravel.
Reverse run allowed. Normal operation status.
Reverse run prohibited. Reverse overtravel.
When
Enabled
After restart
Classification
Setup